Sizing

 Universal Traditional Cm Measurement Inch Measurement
Small 6 7/8 55

21 3/4

Medium 7 - 7 1/8 56-57 22 1/8 - 22 1/2
Large 7 1/4 - 7 3/8 58-59 22 7/8 - 23 1/4
Extra Large 7 1/2 - 7 5/8 60-61 23 5/8 - 24
Extra Extra Large 7 3/4 62 24 1/2